JP2003024339A - Bio-medical cement injection device having tissue collecting function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bio-medical cement injection device having a tissue collecting function by which the collection of bone tissues and the injection of bone cement to be performed percutanously under a CT guide, etc., can be operated by a single device and as once continuous procedures and a series of the procedures is easy (needle piercing, tissue collection and cement injection), and which has a sufficient function for any procedure of them. SOLUTION: The device consists of an injection tube 1 consisting of a metallic hollow tube having a spiral groove 14 formed at its tip, which becomes the injection path of the bio-medical cement, a biopsy needle 2 obtained by engaging an outer needle 3 consisting of a metallic hollow tube with an inner needle 4 consisting of a metallic bar object to be inserted slidably to the inner cavity of the outer needle 3, and a stylet 5 to be inserted to the inner cavity of the injection tube for pushing out cement material remaining in the tube after injecting the cement material. The biopsy needle 2 is inserted slidably into the inner cavity of the injection tube 1. The needle base 12 of the injection tube 1 and the needle base 32 of the outer needle 3 of the biopsy needle; and the needle base 32 of the outer needle 3 of the biopsy needle and the needle base 42 of the inner needle 4 are freely attachable/detachable and provided with a fixing mechanism in the case of insertion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a tissue collecting function used for puncturing a bone disease site such as a bone tumor or a compression fracture due to osteoporosis, and collecting bone tissue and injecting biomedical cement into the bone. The present invention relates to a cement injection device for living body.

[0002]

2. Description of the Related Art In recent years, for the purpose of determining the quality of bone tumors and the like, in a bone biopsy for collecting bone tissue, a technique of percutaneously performing under a CT guide or the like has been performed. There are several known bone biopsy needles. In these needles, the tip of the inner needle of the metal rod is made into a sharp edge of a triangular pyramid point (trocar point) or a diagonal cut point, while the outer needle of a metal hollow tube cuts the tip diagonally and cuts the cut surface. Is formed as a concentric double needle structure in which the inner needle is inserted into the inner cavity of the outer needle so as to project from the tip of the outer needle, and the needle is provided at each proximal end. It has a basic structure that engages the base, and in consideration of puncturing into hard bone tissue compared to a biopsy needle that applies visceral tissue etc., in addition to pressing, puncturing while rotating can be easily done. As described above, there are those in which the needle base (operating portion) is formed large, and those in which devising such as forming an externally ground male screw on the tip portion of the outer needle as disclosed in Japanese Patent No. 2563980 are made.

[0003] On the other hand, percutaneous administration under a CT guide or the like for the purpose of reduction or reinforcement of bone in a case of compression fracture due to osteoporosis or bone tumor, or for the purpose of pain relief of recently reported malignant bone tumor. In general, a technique of injecting a bone cement paste made of calcium phosphate, an acrylic material, or the like into the affected area (percutaneous bone cement local injection therapy, or percutaneous osteoplasty) is performed. As a general means of this bone cement injection, for example, when a vertebral body undergoes a compression fracture, an incision is made in the back, a vertebral arch is opened with a drill, and an instrument in the shape of a syringe is opened. A method of inserting the cement from the part and injecting bone cement is adopted, and as an instrument therefor, for example, JP-A-7-313.
As disclosed in Japanese Patent No. 586, it is composed of a living body insertion tube having a distal end closed and a plurality of openings formed on a side surface thereof, and a cement accommodating portion having a pushing means provided at a proximal end of the insertion tube. There is a filling device for living body cement. In addition, there is also a case where the biopsy needle in the previous stage is substituted instead of using a special tool.

[0004]

However, clinically, for example, in the case of a compression fracture in which a malignant bone tumor is suspected, bone tissue collection and bone reduction and pain relief treatment by cement injection are performed by one continuous procedure. There are cases where it is desired to perform surgery, and an instrument suitable for it is required, but with the above-mentioned conventional bone biopsy needle and bone cement injection instrument, it is not originally intended for the above procedure, so all should be applied alone. I can't.

There is also a report that a bone biopsy needle is used as a substitute for a bone cement injecting device. However, since bone cement is a highly viscous paste and dries quickly, it is a problem if a small amount of a low viscosity one is injected. Although it is not expected, when using a relatively viscous material or a case that requires a certain amount of injection, the inner diameter of the needle tube of the conventional bone biopsy needle is small, and a sufficient filling amount with one procedure Is difficult to inject. In addition, performing cement injection continuously with biopsy is not applicable because it is necessary to remove the needle once to take out the collected tissue in the needle tube after the biopsy procedure.

[0006] Further, as a conceivable means for performing a bone biopsy and bone cement injection by one continuous procedure using a conventional instrument, a tip part of the conventional biological cement injecting instrument is used. A tubular needle tube that is opened, or an outer needle of a metal hollow needle tube having a relatively large inner diameter, and a double needle consisting of an inner needle having an appropriate blade tip made of a metal rod-shaped body as a cement injection needle, , A conventional bone biopsy needle is used as a biopsy needle, and the cement injection needle is drilled at the cement injection site (affected area) of the living body, and the inner needle of the injection needle is removed to secure a passage for inserting the biopsy needle. After that, a procedure of performing a biopsy by inserting the bone biopsy needle into the passage can be considered, but in addition to an injection instrument, a biopsy needle, a plurality of instruments such as a drill is required, or by replacing the needle tube, etc. The problem that the procedure is troublesome Ri, also constrained by mutual compatibility, and the like of each of the instrument is also a concern.

[0007] As described above, in view of the fact that there is no conventional device for continuously collecting bone tissue (bone biopsy) and injecting bone cement with one device, the present invention provides percutaneous CT. Under the guide etc., bone tissue collection and bone cement injection can be performed as one continuous procedure with one instrument, and a sufficient amount of cement injection is possible, and a series of procedures (needle puncture, An object of the present invention is to provide a biological cement injecting device having a tissue extracting function that facilitates tissue extraction and cement injection) and can satisfy any of the steps.

[0008]

A living body cement injecting device having a tissue collecting function according to the present invention is provided with a blade surface at the tip end and a needle base at the base end portion, which serves as an injecting passage for living body cement, and is provided on the tip end side. Injection tube consisting of a metal hollow tube with a spiral groove for ensuring bone puncture in the body, and a metal with a blade surface at the tip and a needle base at the base for tissue collection An outer needle made of an empty tube, an inner needle made of a metal rod having a sharp blade tip and a needle base at the base end for slidably inserting into the inner cavity of the outer needle, and a tip of the inner needle. And a biopsy needle that is made to protrude from the tip of the outer needle and is engaged by a needle base provided at each base end portion, and the tip of the biopsy needle is injected into the lumen of the injection tube. It is slidably inserted so that it protrudes from the tip of the tube to form a triple needle, and the needle base of the injection tube and the needle base of the outer needle of the biopsy needle can be removed. Engage and configure to.

After removing the biopsy needle from the injection tube and injecting the biomedical cement, the biomedical cement remaining in the injection tube is pushed out and slidably inserted into the lumen of the injection tube. It is configured by including a metal rod-shaped stylet having a needle base at the base end.

In addition to the fact that the inner needle protrudes from the outer needle tip, the inner needle and outer needle tip edges of the inner tip of the biopsy needle or the outer needle tip blade surface portion are as if
Like a needle of a book, it forms a triangular pyramid shape (trocar point).

The above-mentioned injection pipe is preferably formed to have an inner diameter of 1.6 mm or more and 3.8 mm or less in consideration of the function of injecting a living body cement and the invasiveness to a living body.

Furthermore, the needle base of the injection tube and the needle base of the biopsy needle outer needle, and the engagement of the needle base of the outer biopsy needle and the needle base of the inner needle are detachable and the puncture function is considered. Then, with the injection tube, the outer needle of the biopsy needle, and the inner and outer needles of the biopsy needle inserted, a fixing mechanism that does not cause disengagement between needle bases or misalignment of needle tubes due to withdrawal operation and rotation operation (screw-in operation). And is configured.

As a fixing function between the needle bases, each needle base of the injection pipe, the outer needle of the biopsy needle and the inner needle is made into a wing shape, and when fixing the needle base of the injection pipe and the outer needle of the biopsy needle, Locking holes are provided on both sides of the wing-shaped needle base, and a locking protrusion is provided on the needle base of the outer needle for biopsy needle at a position to be fitted with the locking hole when the biopsy needle is attached. When fixing the needle base of the outer needle to the inner needle, lock holes are provided on both sides of the needle base of the outer needle, and the needle base of the inner needle is fitted with the lock hole at the time of mounting. The locking projections are provided on the locking projections, and the locking projections are inserted into and engaged with the locking holes to lock and fix the mechanism.

Further, it is preferable that the wing-shaped needle bases of the injection tube, the outer needle of the biopsy needle, and the inner needle have a left-right asymmetric shape with the axes of the respective tubes and needles sandwiched therebetween.

[0015]

According to the means of the present invention, since the injection tube for injecting the biological cement and the biopsy needle for collecting the tissue are integrally formed, percutaneous tissue collection and cement under the CT guide or the like. The injection can be performed continuously by one instrument with one needle puncture. Further, since the tip of the biopsy needle has a sharp cutting edge and a blade surface, and the tip portion of the injection needle forms a blade surface and a spiral groove, puncture to hard bone tissue is approached while rotating the instrument. By doing so, it is possible to pierce more easily and surely.

After the injection of the living cement, a stylet for pushing out the remaining living cement in the injection pipe is provided, so that the cement inside the pipe is generated by leaving the living cement in the injection pipe. It is possible to prevent the solidification of the cement, to allow multiple times of cement injection through the same injection pipe, and to prevent the inconvenience that it becomes difficult to remove the injection pipe due to hardening of the cement.

Further, the inner and outer needles of the biopsy needle are integrated with each other to form a triangular pyramid-shaped cutting edge as if it were a single needle. In comparison, since the cutting edge part that is the most distal part for puncture can be formed large and long, the strength of the cutting edge can be improved and the puncture performance can be improved, and when puncturing to hard bone tissue is considered, it is a great action. Become. Furthermore, when the biopsy needle outer needle is a thin metal hollow tube due to puncture into hard bone tissue,
Since there is a risk of the blade surface spilling, it is expected to use a relatively thick metal hollow tube for the outer needle of the biopsy needle. This effect becomes even greater because the thickness becomes smaller.

The inner diameter of the injection pipe is 1.6 mm or more,
The setting of 3.8 mm or less is designed to ensure a sufficient internal diameter for injecting the biomedical cement, which has a high viscosity and is easy to dry, and at the same time, minimizes the invasiveness to the living body. Care should be taken to ensure that the inner diameter is sufficient depending on the viscosity of the bone cement to be used, and that the one that is as thin as possible is selected.

Furthermore, the needle base of the injection tube and the needle base of the biopsy needle,
Also, the biopsy needle has the needle base of the outer needle and the needle base of the inner needle engaged with each other, and the pull-out operation and the rotation operation do not cause the detachment between the needle bases or the positional displacement between the needle tubes. By providing the above-described fixing mechanism, it is possible to prevent the engagement between the needle bases by puncturing with relatively strong pressure or puncturing while rotating, which is necessary for puncturing the instrument into hard bone tissue. It is possible to prevent the needle tube from coming off, loosening, and rotating, and to prevent the position of the cutting edge from being displaced from each other between the needle tubes, so that reliable puncture is possible.

Further, the wing-shaped injection tube, the biopsy needle outer needle, and the needle base of the inner needle are asymmetrical with respect to the axis of the tube or the needle, so that they can be mistakenly mounted 180 degrees in reverse. Since the needle base is not engaged, it is possible to prevent the needle tip from being displaced during the mounting stage.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a biocement injecting device having a tissue collecting function of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an overall constitutional view showing an example of a biocement injecting device having a tissue collecting function of the present invention. 1A is a front view when a biopsy needle is attached to an injection tube, 1B is a side view thereof. 1C shows a stylet. An injection tube 1 for injecting bio-cement into the affected area, a biopsy needle 2 for inserting tissue into the lumen of the injection tube 1 to collect tissue of the affected area, and after injecting bio-cement,
The biopsy needle 2 is basically configured by a stylet 5 that is inserted into the inner cavity of the injection tube 1 and pushes out the cement agent remaining in the tube.
Is a double needle including an outer needle 3 and an inner needle 4.

FIG. 2 is a configuration diagram showing an injection pipe according to an example of the present invention. The injection pipe 1 is composed of an injection needle 11 and an injection needle base 12. The injection needle 11 is made of a stainless steel pipe and has a distal end cut obliquely, and the cut surface is ground to form a blade surface 13, and a spiral groove 14 is provided up to a position of about 10 mm from the distal end. The base 12 has a wing shape, is adhered to the base end of the injection needle 11, and has a female luer taper 121 at the rear end that serves as a connection portion that engages with the outer needle base of the biopsy needle 2.
And a resin-molded product provided with a fixing mechanism described later. Although the outer diameter, inner diameter and length of the injection needle 11 are not specified, it is particularly preferable to set the inner diameter within the range of 1.6 to 3.8 mm in order to obtain the above-mentioned action. On the outer surface of the tube, it is preferable to provide graduations 15 as an index of the puncture depth at intervals of 10 mm, for example.

FIG. 3 is a block diagram showing a biopsy needle according to an example of the present invention. 3A shows an outer needle, 3B shows an inner needle, and 3C shows a biopsy needle 2 into which inner and outer needles are inserted. The outer needle 3 comprises an outer needle 3 and an inner needle 4 inserted into the inner cavity of the outer needle 3, and the outer needle 3 is made of a stainless steel pipe having an outer diameter which is substantially the same as the inner diameter of the injection tube 11 and has the same outer diameter. 4 is made of a stainless rod-like body having an outer diameter which is substantially the same as the inner diameter of the outer needle 3 and has an inner needle 4 in the inner cavity of the outer needle 3.
When the inner needle 4 is inserted and attached, the tip of the inner needle 4 projects from the tip of the outer needle 3, and the tip portion is formed into an inner needle such that the inner and outer needles 4 and 3 integrally form a triangular pyramid shape (trocar point). The blade edge 41 and the blade surface 31 to the outer needle are provided. On the other hand, each end of the needle tube is adhered to an outer needle base 32 and an inner needle base 42 made of a wing-shaped resin molded product, and concentric with the outer needle base 32 and the inner needle base 42 detachably engaged and fixed. It is configured as a double needle. The outer needle base 32 is the injection needle base 1 described above.
Male luer taper 322 on the front end side that is the connection site with 2.
As further described below, a fixing mechanism to be described later is provided, and a female luer taper 321 is provided on the rear end side that is a connection portion with the inner needle base 42, and a fixing mechanism to be described later is further provided. The male taper 422 is used as the connecting portion of the above, and a fixing mechanism to be described later is further provided.

FIG. 4 is a block diagram showing a stylet according to an example of the present invention. The stylet 5 is composed of an extruding rod 51 and a stylet base 52. The extruding rod 51 is made of a stainless steel rod, has a hemispherical tip, and has a base end bonded to a stylet base 52, which is a resin molded product. Used for the purpose of removing the biopsy needle 2 from the injection tube 1 and inserting the cement agent left in the injection tube 1 into the bone every time the injection of the biocement is completed once,
It is provided in order to prevent the cement agent that hardens in a very short time from being hardened in the tube in the middle of the procedure and hinder the procedure, and to prevent the injection tube 1 from being difficult to remove due to the hardening of the cement agent after the procedure is completed.

FIG. 5 is a block diagram of the tip of the above-mentioned example of the present invention, in which 5A is the injection needle 1, 5B is the biopsy needle outer needle 3, 5C is the biopsy needle inner needle 4, 5D, respectively. Indicates. In addition, in order to facilitate understanding in the drawings, 5A, 5B, 5C
Shows a front view and FIG. 5D shows a side view.
As described above, the tip blade surface 13 of the injection needle 11 has a shape obtained by polishing the oblique cut surface into a taper shape, and the tip of the biopsy needle 2 is
The inner and outer needles 4 and 3 are integrally formed as a triangular pyramid-shaped blade 41 and a blade surface 31. Specifically, the biopsy needle inner needle 4 becomes a triangular pyramid-shaped blade edge 41, and the outer needle 3 becomes a triangular pyramid-shaped blade surface 31 lacking a tip portion having three sharp steeple portions on the hypotenuse, When the inner and outer needles are engaged and integrated, a triangular pyramidal tip portion called a trocar point is formed.

FIG. 6 is a block diagram of the above-described needle base of the present invention. 6A is an injection needle base 12, 6B is a biopsy needle outer needle base 32, 6
C shows a state in which the biopsy needle inner needle bases 42 and 6D are engaged with each other and integrated. Rear end side of injection needle base 12 and outer needle base 3 of biopsy needle
2, the front end side of the biopsy needle outer needle base 32 and the front end side of the biopsy needle inner needle base 42 are detachably engaged and fixed by the following means. The first means, which is an engaging means, is to form a female luer taper 121 on the rear end side of the injection needle base 12 and a male luer taper 322 on the front end side of the biopsy needle outer needle base 32. A female luer taper 321 is formed on the rear end side of the outer needle base 32 of the needle, and a male luer taper 422 is formed on the front end side of the inner needle base 42 of the biopsy needle, which are means for engaging and locking them. In addition, each needle is used as a second mechanism that serves as a fixing mechanism because it does not cause the separation between the needle bases and the position shift of the blade surface due to the operation such as pressing or screwing with a strong force when puncturing the hard bone tissue with a strong force. The base is formed into a wing shape, and the injection needle base 12 has a shape in which wing-shaped portions 124 having locking holes 123 are provided on both sides of the female luer taper 121 in a continuous manner. On both sides of the male luer taper 322 on the front end side, a tapered shape 323 is formed in the insertion direction, and a convex shape 3 is formed in the removal direction.
24, a locking protrusion 325 that serves as a stopper, and a flexible arm 327 that is provided continuously with the locking protrusion 325 and that has a protrusion 326 that moves between the locking protrusions in the expansion / contraction direction. As a shape provided, the rear end side has a shape in which a wing-shaped portion 329 having a locking hole 328 similar to the injection needle base 12 described above is connected, and the biopsy needle inner needle base 42 is the biopsy needle outer needle base. Three
Similar to the tip side of 2, the locking protrusion 423 and the overhanging portion 42
4 has a shape in which flexible arm portions 425 provided with 4 are continuously provided. Each connection engages the male luer taper portion 322 of the outer needle base 32 of the biopsy needle with the female luer taper portion 121 of the injection needle base 12, and at the same time, the flexibility of the arm portion 327 of the outer biopsy needle needle 32. And the taper shape 3 in the insertion direction of the locking protrusion 325.
23, the locking protrusion 325 of the arm 327 of the biopsy needle outer needle base 32 is fitted into the locking hole 123 of the wing-shaped portion 124 of the injection needle base 12, and serves as an engaging means. Since the locking projection 325 has a convex shape 324 in the removing direction only by inserting, the fixing mechanism is locked and cannot be easily removed. This locking means is the same for the case where the biopsy needle outer needle base 32 and the biopsy needle inner needle base 42 are engaged and fixed, and therefore description thereof will be omitted. Further, when detaching, the protruding portions 326 (or 424) of the flexible arm portion 327 (or 425) are pushed from both sides, and the locking protrusion 325 is formed.
(Or 423) is reduced to remove the locking projection 325 (or 423) from the locking hole 123 (or 328), and the engagement can be released and pulled out.

Further, each needle base (12, 32, 42)
Has a left-right asymmetrical shape on both sides with the axis of each needle tube (11, 3, 4) sandwiched therebetween. Specifically, each needle base (12, 32, 42) formed into a wing shape has needle shafts on both left and right wings. A difference is provided in the widthwise direction from the center, while the locking holes (123, 328) and the locking projections (325, 423) serving as the second fixing mechanism are provided with the needle base ( 12, 32, 4
Since it is provided on both sides of 2), the second fixing mechanism engages in the correct direction, but cannot engage in the opposite direction, so that when the engagement is performed, 180 ° It prevents the reverse installation, and each needle base (1
Blade edge and blade surface (1
The positions of 3, 21 (31, 41)) can be surely matched.

The clinical use method according to the embodiment of the present invention will be briefly described as follows. (Puncture) When the puncture position and the puncture target are set under CT fluoroscopy, the needle tip of this product is punctured to the target portion using the CT image as a guide. At this time, since the bone tissue is hard, in addition to the pressing and puncturing operation, the puncturing can be surely performed by screwing in by the rotating operation. 2. (Tissue collection) When the target site is punctured, the inner needle of the biopsy needle is removed by releasing the base fixing and the suction cylinder is attached to the outer needle base of the biopsy needle to collect tissue. . 3. (Injection of cement) When the biopsy is completed, the outer needle of the biopsy needle is removed by removing the fixation of the base, and a syringe containing bio-cement prepared in advance is attached to the injection base, and C
Injection is performed while confirming the spread state under fluoroscopy. 4. After one injection of cement is completed, remove the syringe, insert the stylet into the injection tube, and push out all the cement remaining inside the injection tube until the required amount can be injected. 3. Cement injection and Repeat the operation to extrude the remaining cement of.

[0030]

EFFECTS OF THE INVENTION According to the present invention, for a case in which it is desired to simultaneously perform tissue collection and bio-cement injection by the above-mentioned action, a series of puncture of the device, tissue collection, and bio-cement injection can be performed by one tool. The procedure can be performed continuously and efficiently and easily, and since the minimally invasiveness and safety to the living body are taken into consideration, a tissue sampling function that does not burden the operator or the patient can be achieved. It is possible to provide a living body cement injection device having the same.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram showing a biocement injection needle having a tissue collecting function according to an embodiment of the present invention.

FIG. 2 is a configuration diagram showing an injection pipe according to an embodiment of the present invention.

FIG. 3 is a configuration diagram showing a biopsy needle according to an embodiment of the present invention.

FIG. 4 is a configuration diagram showing a stylet according to an embodiment of the present invention.

FIG. 5 is an enlarged configuration diagram showing an injection tube and a tip portion of a biopsy needle according to an embodiment of the present invention.

FIG. 6 is a configuration diagram showing a base portion of an injection tube and a biopsy needle according to an embodiment of the present invention.

[Explanation of symbols]

1. Injection tube 11. Injection needle 12. Injection needle needle base 121. Female lure taper 123. Locking hole 124. Wing 13. Blade surface 14. Spiral groove 15. scale 2. Biopsy needle 21. Blade tip (blade surface) 3. (Biopsy needle) Outer needle 31. Blade surface 32. Outer needle base 321. Female lure taper 322. Male lure taper 323. Tapered shape of locking protrusion 324. Convex shape of locking protrusion 325. Locking protrusion 326. Overhang part 327. Arm part 328. Locking hole 329. Wing 4. (Biopsy needle) Inner needle 41. Cutting edge 42. Inner needle base 422. Male lure taper 423. Locking protrusion 424. Overhang part 425. Arm part 5. Stylet 51. Extruded stick 52. Stylet base

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Hidehiko Nishizawa             Nagano Prefecture Haneda-gun Tokura-machi Oza Isobe 1490 Stock Association             Inside the company Hachiko Medical F-term (reference) 4C060 LL13                 4C066 BB01 CC04 FF01 KK03                 4C167 AA22 AA23 BB02 BB10 CC30                       DD10 GG22

Claims (7)

[Claims] 1. A blade surface at a tip end and a needle base at a base end,
An injection tube consisting of a metal hollow tube with a spiral groove on the tip side, which serves as an injection passage for biomedical cement, and a blade surface at the tip end,
An outer needle made of a metal hollow tube having a needle base at the base end, and a slidable blade tip that is slidably inserted into the inner cavity of the outer needle,
An inner needle made of a metal rod having a needle base at the base end, the tip of the inner needle is projected from the end of the outer needle, and the tissue collection is performed by engaging with the needle base provided at each base end. A biopsy needle for injection, and the biopsy needle is slidably inserted into the lumen of the infusion tube so that the tip of the biopsy needle projects from the tip of the infusion tube to form a triple needle. A biomedical cement injection needle having a tissue sampling function, wherein a needle base of a tube and a needle base of an outer needle of a biopsy needle are detachably engaged. 2. The slide tube is slidably inserted into the lumen of the injection tube,
The biocement injection needle having a tissue collecting function according to claim 1, comprising a metal rod-shaped body having a needle base at a proximal end thereof, and having a stylet for pushing out the biocement remaining in the injection tube after the biocement injection. 3. The biopsy needle has a tip edge (blade surface) portion in which the inner needle projects from the tip portion of the outer needle, and the inner needle and the outer needle integrally form a triangular pyramid shape (trocar point).
A biocement injecting device having a tissue collecting function according to claim 1, wherein 4. The injection pipe has an inner diameter of 1.6 mm or more,
The biomedical cement injecting device having the tissue collecting function according to claim 1, which has a diameter of 3.8 mm or less. 5. The needle base of the injection tube and the needle base of the biopsy needle,
The needle base of the biopsy needle outer needle and the needle base of the biopsy needle inner needle are detachable, and in addition, in the inserted state, there is a fixing mechanism that does not separate the needle bases by pulling out or rotating operation. A biological cement injecting device having the tissue collecting function according to any one of claims 1 to 5. 6. The fixing mechanism between the needle bases has an injection tube, an outer needle of the biopsy needle, and an inner needle having a wing shape, and when fixing the needle base of the injection tube and the outer needle of the biopsy needle, Locking holes are provided on both sides of the wing-shaped needle base of the tube, while locking projections are provided on the needle base of the outer biopsy needle at a position that fits with the locking holes during mounting. When fixing the needle bases of the outer needle and the inner needle of the biopsy needle, locking holes are provided on both sides of the needle base of the outer needle, while the needle hole of the inner needle is The living body cement injecting device having a tissue collecting function according to claim 5, wherein locking projections are provided at positions to be fitted, and the locking projections are fitted and engaged in the respective locking holes to lock and fix. 7. The biocement having a tissue-collecting function according to claim 6, wherein the wing-shaped needle bases of the injection tube, the biopsy needle outer needle and the inner needle have a left-right asymmetric shape with the axes of the respective tubes and needles sandwiched therebetween. Injection device.